To remove a search agent, you need to go to the menu option with the same name (it could also be found under "More" at the bottom of the menu). You can also open it via this link - https://bostadsportal.se/en/agents/
Via Search agents in the menu, you can see all the agents that you have created and how long they are valid. You can remove individual agents, e.g. those without filters, by choosing "Delete SearchAgent" on the search results you no longer want to receive.
You can also remove all agents by pressing "Delete all search agents".